1. Let's start by understanding the concept of Domain and Range in relations and functions. 2. The domain of a relation or function is the set of all possible input values (usually $x$-values). 3. The range is the set of all possible output values (usually $y$-values). 4. To find the domain and range from a graph, look at the horizontal spread for domain and vertical spread for range. 5. From tables or ordered pairs, list all unique $x$-values for domain and all unique $y$-values for range. 6. Example: Given ordered pairs $(2,3), (4,5), (2,7)$, domain is $\{2,4\}$ and range is $\{3,5,7\}$. 7. Remember, domain and range can be discrete sets or continuous intervals depending on the relation. 8. Practice identifying domain and range from different representations to build confidence. Final tip: Always check if the relation is a function by ensuring each domain value maps to only one range value.